Life Cycle of Heterodera glycines in Resistant and Susceptible Soybean
Bibliographic record
Abstract
The life cycle of the soybean cyst nematode lasts approximately 21-24 days at temperatures ranging from 23 °C to 25 °C. Mean temperatures above 25 °C are often found in Goiás State and in other Brazilian regions. Thus, the aim of the present study is to assess the penetration and cycle duration of Heterodera glycines Type 0- (race 3) in nematode-resistant and susceptible soybean cultivars grown in greenhouse under controlled conditions. The study was conducted at soil temperatures ranging from 23.9 °C to 31.1 °C using two soybean cultivars that were assessed in ten different periods; each assessment was conducted in six plants. The herein used soybean cultivars were BRS Valiosa RR and BRSGO 8860RR, which were, respectively, susceptible and resistant to the nematode. Root staining assessments were performed 2, 4, 6, 9, 12, 15, 18, 21, 24 and 30 days after inoculation (DAI). Besides the root staining assessments, the females and eggs were also assessed through extraction using the sieving and flotation method, at the 30th DAI. Heterodera glycines J2 penetration was similar in both the susceptible and the resistant cultivars throughout the assessment period. It indicates that the nematode penetration was not affected by resistance. The Heterodera glycines cycle at soil temperature ranging from 23.9 °C to 31.1 °C and at room temperature ranging from 27.0 °C to 36.3 °C was complete in 15 days, in both the susceptible and the resistant cultivars. A similar number of J2 has penetrated the roots of both cultivars and greater penetration intensity was found from the 6th to the 15th DAI. The peak J3, J4 and female formation period in the resistant cultivar was later than that observed in the susceptible cultivar.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".